This is achieved in a variety of ways, but essentially involves creating a raised groove or area along the posterior border, on the fitting surface.This is often referred to as the postdam.
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释义
这可以通过多种方式达到,但基本上不外乎,在基托组织面沿后缘制作一个突起的沟或区域,这就是常提到的后堤。
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